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Number of complexes that are paramagneti...

Number of complexes that are paramagnetic in nature with number of unpaired are :
1.`[MnCl_4]^(2-)` 2.`[Mn_2(CO)_10]` 3.`[V(CO)_6]^(-)` 4.
5.`[Pt(NH_3)_4Cl_2]` 6.`[Co(NH_3)_2(H_2O)_4]Cl_2` 7.`[Ni(CN)_4]^(2-)` 8.`[Cu(H_2O)_4]^(2+)`
9. `K_3[Cr[CN)_5]`

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The correct Answer is:
4
`[MnCl_4]^(2-),[Ni(H_2O)_6]Cl_2,[Co(NH_3)_2(H_2O)_4]Cl_2,K_3[Cr(CN)_6]`
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